VANCOUVER/BEIJING The daughter of Huawei’s founder, a top executive at the Chinese technology giant, was arrested in Canada and faces extradition to the United States, roiling global stock markets as it threatened to inflame Sino-US trade tensions afresh.

The shock arrest of Meng Wanzhou, 46, who is Huawei Technologies Co Ltd’s chief financial officer, raises fresh doubts over a 90-day truce on trade struck between Presidents Donald Trump and Xi Jinping on Saturday – the day she was detained. China has already demanded her release.

Wanzhou’s arrest, revealed late on Wednesday by Canadian authorities, is related to US sanctions on Iran, a person familiar with the matter said. Reports said she has obtained a ban on publication of the details of her arrest.

The arrest and any potential sanctions on the world’s second biggest smartphone maker could have major repercussions on the global technology supply chain. Shares in Asian suppliers to Huawei, which also counts Qualcomm Inc and Intel among its suppliers, tumbled on Thursday.

Wanzhou, one of the vice chairs on the company’s board and the daughter of company founder Ren Zhengfei, was arrested on December 1at the request of US authorities and a court hearing has been set for Friday, a Canadian Justice Department spokesman said. US authorities have been probing Huawei since at least 2016 for allegedly shipping US-origin products to Iran and other countries in violation of US export and sanctions laws.

Huawei, which generated $93 billion in revenue last year, confirmed the arrest in a statement. “The company has been provided very little information regarding the charges and is not aware of any wrongdoing by Ms Meng,” it said. She was detained when she was transferring flights in Canada, it added.

Why is Huawei controversial?

Huawei is under intense scrutiny from US and other western governments about its ties to the Chinese government, driven by concerns it could be used by the state for spying. It has been locked out of the US and some other markets for telecom gear. New Zealand has banned Huawei citing national security, following a similar move by Australia. Huawei has repeatedly insisted Beijing has no influence over it.